/*
 * Copyright (C) 2010 Geometer Plus <contact@geometerplus.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

package org.geometerplus.fbreader.network.opds;

class RelationAlias implements Comparable<RelationAlias> {
    final String Alias;
    final String Type;

    // `alias` and `type` parameters must be either null or interned String.
    RelationAlias(String alias, String type) {
        Alias = alias;
        Type = type;
    }

    @Override
    public boolean equals(Object o) {
        if (o == null || !(o instanceof RelationAlias)) {
            return false;
        }
        RelationAlias r = (RelationAlias) o;
        return Alias == r.Alias && Type == r.Type;
    }

    @Override
    public int hashCode() {
        return (Alias == null ? 0 : Alias.hashCode()) +
                (Type == null ? 0 : Type.hashCode());
    }

    public int compareTo(RelationAlias r) {
        if (Alias != r.Alias) {
            if (Alias == null) {
                return -1;
            } else if (r.Alias == null) {
                return 1;
            }
            return Alias.compareTo(r.Alias);
        }
        if (Type != r.Type) {
            if (Type == null) {
                return -1;
            } else if (r.Type == null) {
                return 1;
            }
            return Type.compareTo(r.Type);
        }
        return 0;
    }
}

